.flex_cen {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex_btn {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex_cen_column {
    display: flex;
    justify-content: flex-start;
    align-items: center;
    flex-direction: column;
}
.flex_str{
    display: flex;
    justify-content: flex-start;
    align-items: center;
}
.flex_str_str{
    display: flex;
    justify-content: flex-start;
    align-items: flex-start;
}
div {
    box-sizing: border-box;
}
